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0dc2e0572f
Previously, eg. "dx" would not be parsed as "dx" after a function, since the parser did not keep track of whether or not it was currently inside an integral or not, properly. This commit fixes that, and also makes it possible to use any variable after the "d", eg. "dy". The integration function was also put in its own file: calculus.rs. |
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| .. | ||
| src | ||
| Cargo.toml | ||
| LICENSE | ||
| README.md | ||
| wasm-build.sh | ||
kalk
Kalk is a math parser library that supports user-defined variables and functions. An example of what it can parse:
f(x, y) = sum(1, 3, (2sin4/x!)^y) + cos(n deg)
a = 3
f(a, 2)
>> 1.1899401098014355
Features
- Operators: +, -, *, /, !
- Groups: (), ⌈⌉, ⌋⌊
- Pre-defined functions and constants
- User-defined functions and variables.
f(x, y) = xy,x = 5 - Understands fairly ambiguous syntax. Eg.
2sin50 + 2xy - Syntax highlighting
- Special-symbol completion on tab. Eg. write
sqrtand press tab. It will be turned into√.
Rust Usage
use kalk::parser;
let mut parser_context = parser::Context::new();
let precision = 53;
let result = parser::eval(&mut parser_context, "5*3", precision).unwrap().unwrap();
assert_eq!(result.to_f64(), 15f64);
Using f64 instead of rug::Float
The cargo feature rug enables rug, and is used by default. If you disalbe this, kalk will use f64 instead, making it more portable.
Compiling
Make sure you have diffutils gcc make and m4 installed.
JavaScript Usage
const kalk = await import("@paddim8/kalk");
const context = new kalk.Context();
console.log(context.evaluate("2pi + 3").toScientificNotation().toString());